Ibrahim Salih Al-Juboori, S. 2000. Knowledge Project in Al-Ressala Book: A Sociological Study of Linguistic Knowledge for Imam Al-Shafi’i (Died 204A.H). Adab Al-Rafidayn. 40, 56 (Jan. 2000), 285–360. DOI:https://doi.org/10.33899/radab.2010.30817.